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Practical Weed Science for the Field Scout: Corn and Soybeans
Johnsongrass (Sorghum halepense)
Perennial grass
A perennial from thick, white rhizomes that may reach 6-1/2 feet in height. Leaves are rolled in the shoot, without auricles, 6 to 20 inches long by 10 to 30 mm wide, with a prominent white midvein. Leaf blades are usually without hairs on both surfaces, although some hairs may be present at the base of the leaf blade. The ligules are 3 to 4 mm long, membranous, and often toothed at the top. Sheaths are round to somewhat flattened and usually without hairs, but sometimes hairs may be present along the margins. Seedheads are large, open panicles, often with a purplish tint.
IPM1007, revised June 2007
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